Modification of mechanical and thermal properties of fly ash-based geopolymer by the incorporation of steel slag

Abstract

Geopolymeric binders (GB) were produced using fly ash (FA) and electric arc furnace slag (EAFS). The slag has been added in the range of 0-40 %. The effects of slag content on the strength, microstructure and thermal resistance were evaluated. It was found that the amount of EAFS up to 30 % positively affects the strength evolution of GB. The main reaction product of FA/EAFS blends was amorphous N-(C)-AS -H gel along with geopolymer-type gel (N-AS -H). Thermal resistance of GB was considered from the standpoint of their mechanical and dimensional stability after heating in the temperature interval of 600-800 o C. The changes in mechanical and thermal properties of GB after heating are attributed to the changes in their structure. The results have shown that EAFS negatively affects the thermal resistance of

Microstructural and Mechanical Properties of Alkali Activated Materials from Two Types of Blast Furnace Slags

“…The thermogravimetric results show different trends in the weight loss of the AAS materials as reported in the TG and DTG curves in Figure 5. Normally, in alkali-activated materials the weight loss is characterized by several weight loss changes: the first stage is the loss of the adsorbed or interlayer water of C–S–H [4,31] and the decomposition of ettringite [32] between 30 and 200 °C, and, between 200 and 600 °C, the dehydroxylation process of the gel phase such as C–S–H and C–A–S–H [33,34]. The weight loss after 600 °C is believed to be the result of the viscous sintering process of the alkali-activated materials matrix [31] and the decomposition of anhydrite [34].…”

A Review of Preliminary Experimental Factors of Making Geopolymer Paste as a Passive Fire Protection System

“…Meanwhile, examples of alkali are caustic soda (NaOH) and potassium hydroxide (KOH) [24]. Other studies discussed geopolymers that consist of aluminosilicate sources such as fly ash, furnace slag and metakaolin [25][26][27][28][29][30][31][32][33][34][35][36]. Besides, geopolymers are consisting of alkali liquid such as sodium hydroxide and sodium silicate [25].…”

“…The term poly(sialate) stands for silicon-oxo-aluminate at the time of chemical design for the geopolymer aluminosilicate. Poly(sialate) is a chain and ring polymer with Si 4+ and Al 3+ on 4-fold coordination with oxygen [22,30]. The general formula of poly(sialate) is presented in Equation (1) [10,41]:…”

Advances in Understanding the Alkali‐Activated Metallurgical Slag

“…ey also thought C-S-H gel and N-A-S-H gel as self-healing products had a positive effect on self-healing property [55]. However, Niklioć et al [56] had different conclusions about the type of reaction product and the development of compressive strength due to high curing temperature of 65°C at the early age. ey thought that the main products were N-(C)-A-S-H gel along with N-A-S-H gel [56].…”